A、<img width="76" height="19" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/1cc0de96-1ddc-4c24-bd55-3b278dbd6d69.png" />
B、<img width="75" height="19" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/6cf66e3f-5ca0-4c45-9594-a00f812cf1bb.png" />
C、P=S-Q
D、P=UI
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